In the August 1929 issue of Modern Mechanics John Demenjoz of Bridgeport, Connecticut regaled reader with plans for his incredible flying sailplane.
According to its inventor, the vehicle would be 30 feet long, 40 feet wide, and weigh less than 600 pounds. Also, it would take to the skies on nothing but a strong breeze.
It has no motor, and is to be propelled by wind only. Mr. Demenjoz is shortly to take his machine to Old Orchard, Me., where he will make it the location for the crucial tests of his new invention.
Original in his idea of making a plane go both ahead and into the air by the use of sails similar to those of a boat, the French inventor has carefully calculated all the requirements of stability, he says, and is confident that with a wind of 20 miles an hour he should be able to fly. He further predicts that he will be able to fly as high as there is any wind. He estimates his craft will attain a speed of 40 miles an hour.
In a more visually amusing reality, we've perfected this design and are holding regattas in the sky, christening our sailplanes by crashing them into bottles of champagne suspended by weather balloons.
[Via Modern Mechanix]